DeltaWalker sessions offer a quick way of performing now a file or a folder comparison with the exact same parameters as it was performed in the past. Thus a comparison session holds all the information required to run that comparison the same way you ran it last time - e.g. the pathnames/URIs of the compared resources, filters, as well as all other session-specific properties.
Comparison sessions share many similarities with browser sessions - both are created automatically as you use the program, both refer to URIs or pathnames, and both are easily accessible.
As far as sessions are concerned, there are two types of preferences in DeltaWalker:
Let's look at an example:
You launch DeltaWalker and you open a pair of files for comparison. You then realize that you are not interested in character case differences (by default those are calculated). To ignore those you click on the dropdown arrow next to the Comparison Settings toolbar button and select "Ignore Character Case" . If the files you are comparing have character case differences you would immediately see the effect of the change.You just modified the settings of the file comparison you are currently working on. The change was automatically saved as part of that session sothe next time you load it, it will be there. This is not a global-preference change however, which means that if you open a new file comparison it would have "Ignore Character Case" unselected, as this is the default value for that preference.
If, on the other hand, you modified the "Ignore differences in character case" preference default in the All Comparison preference page that value would be used in all subsequent new file comparisons. It will not however be applied to existing file comparison sessions - those you need to modify individually.